Welcome to the Wefugees Community and thank you for reaching out to us.
I agree with Gentle james: to be able to give more tailored information, it would be good to learn a few essential details about your case, i.e. which type of residence you are currently holding (can you name the the respective section of the law?).
Generally speaking, I would always recommend to complete a vocational training ("Ausbildung") in Germany in order to obtain a formal qualification. Otherwise, employees might be at risk to "get stuck" in jobs in the unskilled labor sector where they are potentially exposed to structural disadvantages (in the context of the German residence law, payment, job security etc.). Depending on your individual situation as well as your reasons for thinking about quitting the vocational training, you may also consider to change the training workplace or maybe even the professional field.
For personal and in-depth counselling, you can also contact a migration counselling office (Migrationsberatung/"MBE" or the counselling for your young migrants/under 27y. "JMD"). Let us know if you need support in finding respective services in your area. In any case, please also don't hesitate to get back to us with any further questions.
All the best,